How do polar and nonpolar covalent bonds compare?

1 Answer
Jan 30, 2017

Polar bonds share electrons unevenly


When elements of varying electronegativity covalently bond, the electrons are pulled towards the more electronegative atom.

This will mean that the more electronegative side will have a partial negative charge (due to more probability of electrons) and the less electronegative side will have a partial positive charge.

Polar bonds also often contribute to a net dipole moment of a molecule. This basically means that there are partial charges that make a molecule overall polar. One example might be water: in H20, oxygen is very electronegative, and hydrogen is less so. This means that oxygen is more negative and hydrogen is more positive. This is why water is cohesive (can stick together): The positive ends stick to the negative ends.